Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: If six persons sit in a row, then the probability that three particular persons are always together is?

 Option A: 1/6

 Option B: 1/1

 Option C: 1/5

 Option D: 1/9

 Option E: 1/2

Option C